Connecting and trimming curves

Hi all,

The black curves that you see here have been translated inwards from the surfaces representing a “Space” object in Revit. I need to trim the corners and connect the unconnected sections of the curves to create a nice clean line which I can turn into a solid to generate a grid of points.
I am having trouble working out how to do this though…
The red line represents the final result that I am after. Can anyone help point me in the right direction for this? Thank you so much.

Try to get all perimeter lines in one polycurve and follow the below shot.

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Thank you very much, this put me on the right track!

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